Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color.)
At the beginning of each end step, if you created a token this turn, draw a card.
Flood the board with tokens every turn so Bennie draws you a card on each end step, turning a go-wide army into a relentless card-advantage engine. You build a wide board, refill your hand, and grind opponents out before closing with anthems or a big overrun. Convoke also lets your tokens recast Bennie cheaply if she's removed.
Mono-white card draw, one of the color's biggest weaknesses, solved repeatedly
Triggers on each player's end step, so you can draw up to four cards per turn cycle
Cheap to recast via convoke if she dies
Token strategies are deep and well-supported in white
Reliant on producing a token every turn or the draw simply doesn't happen
Mono-white means limited interaction, ramp, and no built-in combo finishers
Vulnerable to board wipes that erase your token army and engine simultaneously
Removal of Bennie shuts off the card advantage until you recast her
Legendary Creature — Elf Druid
or one mana of that creature's color.)